diff --git a/backlog/tasks/task-028 - OSM-Canvas-Integration-Foundation.md b/backlog/tasks/task-028 - OSM-Canvas-Integration-Foundation.md
index 10a0aa7..c2bad21 100644
--- a/backlog/tasks/task-028 - OSM-Canvas-Integration-Foundation.md	
+++ b/backlog/tasks/task-028 - OSM-Canvas-Integration-Foundation.md	
@@ -5,7 +5,7 @@ status: In Progress
 assignee:
   - '@claude'
 created_date: '2025-12-04 21:12'
-updated_date: '2025-12-04 21:12'
+updated_date: '2025-12-04 21:24'
 labels:
   - feature
   - mapping
@@ -33,9 +33,28 @@ This is the foundation that task-024 (Route Planning) and other spatial features
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
 - [ ] #1 OSM raster tiles render as canvas background layer
-- [ ] #2 Coordinate transformation functions (geo ↔ canvas) working accurately
+- [x] #2 Coordinate transformation functions (geo ↔ canvas) working accurately
 - [ ] #3 Zoom levels map to appropriate tile zoom levels
 - [ ] #4 Pan/zoom gestures work smoothly with tile loading
 - [ ] #5 Shapes can be placed with lat/lng coordinates
 - [ ] #6 Basic MapLibre GL or Leaflet integration pattern established
 <!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+## Progress (2025-12-04)
+
+### Completed:
+- Reviewed existing open-mapping module scaffolding
+- Installed maplibre-gl npm package
+- Created comprehensive geo-canvas coordinate transformation utilities (geoTransform.ts)
+  - GeoCanvasTransform class for bidirectional geo ↔ canvas transforms
+  - Web Mercator projection support
+  - Tile coordinate utilities
+  - Haversine distance calculations
+
+### In Progress:
+- Wiring up MapLibre GL JS in useMapInstance hook
+- Creating MapShapeUtil for tldraw canvas integration
+<!-- SECTION:NOTES:END -->